View is the REBOL executable. Unless you create an Info.plist file for your app, MyScript should match your MyScript.app bundle name. Your working path will be MyScript.app/Contents/Resources/ — you can put all your images and support files there.

Future

I’d like to devise a way to pass arguments, specifically to assign filetypes. My fear is that it may get to complex (note: this is not the same as assigning .r types to REBOL)

More

Take a look at Ashley’s CookBook for bundling encapped SDK applications as well as adding metadata to your bundle.